Depending on how much fat you have left a fat transfer to the hips might be a good solution. Buttock implant removal will make your buttock softer and more natural but smaller. It really depends on what your goals are. Be sure to choose a board certified plastic surgeon who specializes in this...
I always dissect the pocket for the implant, so that the pocket is just barely large enough to accommodate the implant. This allows for less freedom of movement. You would need to return to the board certified plastic surgeon who placed your implants for advice.
You are an excellent candidate for buttock implant surgery. Please be sure to choose a board certified plastic surgeon who specializes in buttock implants and has a proven history of success with such a surgery.